Internal-grinding machine



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INTERNAL GRINDING MAGHHZE Filed April 11, 1921 2 Smets-$199@ 1 @Wawy www NM2-'Amm ALBEN M. BRAKE..

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INTERNAL GRINDING PMCHNE Fixed April 11 1921 a snwzwsmw, 2 i

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.Patentedept l/S, i923.

lpddgll J'IHES N. HEALD AND ALDEN TO HEALD MACHINE COMPANY, OF WORCESTER, MASSACHUSETTS. A CORPORATION or Messnoiaosnrrs.

INTERNAL-GRINDIN G MACHINE.

Application tiled April 11, 1321. Serial No. 460,211.

.To @ZZ whom t may concern.'

Be it known that we` JAMES N. HEALD and Amen* DRAKE, citizens of the United States@ both residing -at TVorcester. in the couhty'oic Yorcester and State oi Massachuseits. have invented a new and useful Internal-Grinding Machine, of which the followis a specification.

in ilhis invention relates to a machine for producing groiind surfaces' on `metal and particularly to a machine for grinding internal surfaces. ln such machines Tit is customary to support the Work on a work spindle rotatable in fixed bearings and to mount the grinding wheel spindle on a able axially relative to the Work. During the grinding operation a slow automatic axial wheel feed is desired, while rapidinanual operation ispreferred for withdrawing the tool to the Work. Y

lt is the general object of our invention to provideimproved means for controllingr two different feedingl mechanisms, so devised that a quick change may be made from one feed to the other and that only one feeding mechanism may be connected to move the carriage at any onetime.

In the preferred form, this desired end is accomplished by the use of a'single operating lever which may he moved to render either one of two clutch connections operaperrnit gauging or removal oi tive andthe other inoperative.

A further. featurel of our invention -relates to the provision of a control device'by which the feed may be changed from nut/omatio to.. manual,` at the same time disconnecting the driving power from the Work the grinding Wheel. AT

spindle and preferably applying a brakev thereto so that rotation of the Work ivill he stopped promptly durin the Withdrawal o1 is 'permits the operator to immediately gauge the work or removea finished piece of work Without loss of vtime'.

Our invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

carriage mov- A preferred form of our invention isshown `in the drawings in which- Fig. l is a front elevation of our improved machine;

Figs. 2, 3 and 4 are enlarged fragmentarv details to be described; y i

Fig. 5 is a front elevation of the automatic feed reversing mechanism;

Fig. 6 is a sectional side elevation thereof taken along the line 6--6 in Fig. 5;

Fig. 7 is a sectional elevation of the vertical feed shaft for the wheel carriage;

Fig. 8 is a plan view of the feed shift lever;`

Fig. 9 is a. detail view looking in the direction of the arrow 9 in Fig. 8, and

Fig. 10 is a plan View of one of the vclutches shown in Fig. 7. f

BRAKE, OF WORCESTER, MASSACHUSETTS, .ASSIGNORS Referring to the drawings. we have shown a grinding machine comprisingr a base 2O on `which a` Work spindle 2l is rotatable ln hearings 22. The spindle is provided with a. drivingpulley 23 connected hya belt' 24 to va cone pulley 25 which, in turn, is con nected by a second belt 26 to a cone pulley 27 loose on a driving shaft 28. The shaft 28` 75 may be driven in' any convenient manner as by a belt 29 and pulleyv 30. A clutch 31 1s provided for the cone pulley 27 and* is controlled by a sliding sleeve 32 positioned by a depending arm 33 of a three-armed lever 34.

The lever 34 is pivoted at 35 on the frame 20 and a second arm 36 thereof is provided with a brake 37 adapted to engage one ofthe surfaces of the cone pulley 27. The third or upwardly extending arm 38 of the lever 34 has a pin and slot connection with ari erm 39 .fixed to a cross shaft 40. A lever 4l is .fixed to the outer end of the cross shaft and comprises an upwardly extending handle 42 and a laterally extending slotted arm 43. When the lever 42 is moved to theA lett inv plunger (Fig. Ll) holds the clutch sleeve 32 normally in its withdrawn position but permits the saine to be yieldingly moved to operative position when desired.

The work may be secured lo the spindle 2l in .any desired or convenient manner and is preferably covered during tbc grinding operationby a easing' or guard 46.

The grinding wheel W is mounted ou the end of a spindle 50. rotatable in a wheel head 5l and .dri`ven in any convenient manner as by belts 52 and The head 5l is mounted for transverse adjustment ou a 'wheel table or carriage 5d. mounted to slide on the base 20 and preferably provided ivith'a rack (not shown) engaged by a. pinion v55 (Figfi fixed to the upper end ot' a vertical feed Shaft.

.Two separate for rotating the shaft 58. One of these coinprises a hand Wheel 59 (Fig. l) mounted at the iront ot the grinding machine on a short shaft 60, the rear endot which is connected by spiral gears 61 and 62, (Fig. 7) to a clutch casing 63 loosely rotatable on the shatt 58. An expansible clutch member 64 (Fig. 10) is formed integral one point in its circumference with a clutch hub 65 tired to the shaft 58. tioned for engagement bv of a double sliding sleeve :67, (Fig. 7) which is positioned by toe yoke shaped arm 6% (Fig. 8) of a clutch lever 69. The lever (39 is mounted on a fixed pivot and has abandle portionl in which is mounted a stud or pin 71ada-pted to extend 'into a slot (Fig. 9) in the end of the arm 43 ot the handle lever il previously described. The stud 7l may be positioned as shown in Fig'. S to connect the two levers, or may be withdrawn to disconneet the levers. and will be held yieldingly in either position by a spring plunger 72.

The power mechanism for rotating the shaft 58 comprises a driving shaft 73 5) continuously rotated by a belt 74 which connects a cone pulley Z5 on the shaft 73 to a small cone pulley 76 (Fig. l) on the right hand end of the driving shaft 28. The sha-ift '73 is thus continuously rotated at either one ot two desired speeds. A double clutch member 77 is keyed to the shaft 73 and is slidable to engage clutch faces on either one oit tvvo bevel pinions 78 and 79 meshing bevel rear 80 fixed to the front end of a, short slat't di. (Fig. 6). A worm 82 on the Shait 81 engages a. worm Wheel 83 (Fig. Y) which is fixed to a second clutch casing' 84 loosely rotatable on the shaft 58 but adapted to be connected thereto by an e'apansible clutch member S5 as in the device previously described. The member 85 is controlled by a clutch lever 86 mounted for engagement by the beveled. lower ergtl of the sliding' sleeve 67.

The reversing clutch .member 7 T (Fig) is mechanisms are provided` A lever 66 on the hub 65 is posi' one beveled end lltheelutch sleeve G7 to engage the lower With positioned by a. reverse lever 90 mounted/on ay fixed stud 9i and having a` pin 92 positioned tor engagement by dogs 93 (Figifl) longitudinally adjustable on the table or carriage Only one of these dogs is shown in the dra wings but it will be understood that a pair of dogs commonly pro videdvt-o reverse the clutch at each end ofv the desired travel ot the carriage.

SpringA levers S9 and lockingr iam plates (not shown) are provided for shittingn the reverse lever and clutch quickly troni one operative position to the other. The details and operation of this mechanism need not be further described it forms no part ot' the present invention.

A third dog 94 (Fig. 1) 'on the table 54 is positioned to engage the upper end oty the eveiuor handle 42 when the table and grind ingwvlieel are fully Withdrawn from the work.

Having described the construction of our improved grinding machine", we will new describe its operation. -llhen the handle 42 is moved to the lettin F ig. `1`, or the handle Sli) 70 is pullednpw'ard, th brake is released and the Work is rotated as previously described. Vftthe same time the yolrearins GS (Fig. 8) are moved downward, causing clutch casing 84 with the shaft 58. rlhe ma,- rhine is thus connected for automatic feed and reversal of the Wheel carriage 5d under the control of the dogs 93.

When it is desired to Withdraw the wheel and stop the Work for examination or re moral, the handle 42 may be pulled to the right, thus shiftingr the clutch sleeve 6'? to connect the upper clutch casing 63 to the clutch 6ft and shaftB. and at the' same time to disconnect the Work spindle and apply the brake to the cone pulley 27, also stopping the operation ot the pump. The hand wheel 59 is immediately available vtor withdrawing the wheel carriage 54:, although it is fully disconnected and stands idle during; the automatic feedof-the carriage. lt it is desired to shift the feed and Withdraw the carriage 54 without stopping the Worlr Spindle, the stud 7l may be pulled outward to disconnect the arm 43 from the handle 70. lWhen the carriage is moved to the extreme ri eht. the dog 94.- ivill move the handle 42 to stop the Work.

The advantages of our improved construction are thus readily apparent and it will be evident that changes and modifications can be made .in our invention by those skilled in the art, without. departingg'l from the spirit and scope thereof as set forth in the claims. Therefore, We do not wish to be otherwise limited'to the details herein disclosed but what We claim is a l. ln a grinding machine, a Wheel spindle, driving mea-ns therefor, a grinding Wheel,

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Y driving awhecl table. power feeding means therefor, manual feeding means therefor, and oontrolling mechanism effective to disconnect. said spindledriving means and to simultaneously render said power feeding means said manual means opera- 2. Ina

grinding machine, means therefor, a controlling device for said' driving means, a grinding wheel, awheel table, means to feed the wheel table manually', additional means to, 'feed said table by power, a second controlling device by which said manual and power-feeding means may be rendered separately opera -.vork spindle,

able, and a connection between said devices whereby theyanay be slrnultaneously actuated to disconnect said driving means and to connect said table feeding means for manual lo eration.

n a grinding wheel, a Work spindle, driving means therefor, a clutch lever. controlling said driving means, a driving wheel,

they may be connect said a wheel table, means to-fed the Wheel table, manually,`udditional means to feed said table by' ower, a second clutch lever by which sain feeding means may be rendered separately operable, and a detachable connection between said clutch levers whereby simultaneously actuated to dis spindle driving means and to connect said table u'al operation.

4. In a grinding machine, awork spindle. a clutch lever controlling,r the work spindle, a. grinding wheel, a wheel table, means to feed the wheel table, a second clutch lever controlling the table feed7 and a detachable connection between said clutch levers providing for movement of said levers separately 0r simultaneously.

In testimony whereof we have hereunto aixed our signatures.

JAMES n. HEALD. ALDEN M. BRAKE.

feeding means for man- 

